clive sounds good on the bofor tubes  they are not common here wartime ,shame they are 3" the duals i am after some 4.2" like that here 3' 'are mostly in three round carriers two per box  
 
okay as you seem to be keen on box  numbers here are a few belwo never really loked at them before in that detail  
 
all care no responsibility for errors as some ar hard to read  
 
6pdr  four round  c263 mk1 
6pdr six round c264  1 as and s 1942 
6pdr four round  c265 11  1942 
17pdr flat tin  cc323   1 1944 
17pdr sealed tin two round m203  b/1 1943??? 
17pdr proj box botom marked 18pdr  LP11 soasume a reworked 18pdr box  
3" wood boxes with either rope or wire handles  b162 
4.2"   b176 
bofor c219 1940 
2pdr c207 
 
hope this helps  
 
regards 
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